Question: What is the main Japanese dialect ?
Paraphrase: What's Japan's main dialect?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P4913 wd:Q5287 . ?sbj wdt:P31 wd:Q33384 } 
Answer: Okinawan Japanese, Tsugaru dialect, Kansai dialect, Hokkaido dialects, Okayama dialect, Tōhoku dialect, Hokuriku dialect, Chūgoku dialect, Hachijō dialects, Kantō dialect, Shikoku dialect, Tōkai–Tōsan dialect, Umpaku dialect, Kyūshū Japanese, Gotō dialect